Board Thread:General Discussion/@comment-35078634-20180413202622/@comment-32750412-20180413220615

This may be the reason,it does not damage Pokémon with the Ability Magic Guard. Rapid Spin removes Steath Rock from the user's side of the field if it affects its target; Defog removes the effect of Stealth Rock from the target's side of the field if it affects its target.